1. CONDITIONAL CLAUSES

2. Conditionals always have two parts: the Main Clause and
the IF Clause
(When the If Clause goes first, it is followed by a comma, but you can also put the Main Clause first without using a comma between the clauses.)

3. Conditional Conjunctions:
IF is the most common one.
Others are:
As long as
Provided/ Providing (that)
UNLESS = If not

4. (0 &) 1st Type Conditional (Real Possibility)
It is used for real - or possible - situations.
The If Clause goes in the Present Tense (usually Simple):
If you want , …
If you are late again, …
If you have done your homework, …

5. The Main Clause can go in: - Present Tense - Imperative
- Present Modal Verb: can, may, must.
But usually in
- FUTURE SIMPLE:
If you want, I’ll help you
I’ll be angry if you’re late again
If you’ve done your homework, you can go out

6. UNLESS is the opposite of “If”:
If she doesn’t call soon, I’ll be angry =
Unless she calls soon, I’ll be angry.
He will be late if he doesn’t hurry up =
He will be late unless he hurries up

7. 2nd Type Conditional Often called the "unreal" conditional because it is used for unreal - impossible or improbable - situations. This conditional provides an imaginary result for a given situation.

8. - Simple Past Tense Conditional Tense:
The If Clause goes in
- Simple Past Tense
The verb 'to be', when used in the 2nd conditional, is usually conjugated as 'were'.
The Main Clause goes in
Conditional Tense:
Would(n’t) + infinitive
(Could or Might are also possible but less common)
If I were you, I’d go to the doctor’s.
If he studied more, he’d pass all his subjects.
They would buy a new house if they had more money.

9. 3rd Type Conditional
Known as the "past" conditional because it refers only to past situations with hypothetical results.

10. WOULD(N’T) (Could/ Might) HAVE + Past Participle
The If Clause goes in
Past Perfect
The Main Clause takes:
WOULD(N’T) (Could/ Might) HAVE + Past Participle
He would have found a new job if he had tried.
We wouldn’t have seen this film if you hadn’t told me about it.
If you had studied for the exam, you would have passed.